Die head



r 1,699,373 5. F. NEWMAN El AL Jan. 15, 1929.

DIE HEAD 5- Sheets-Sh'eet 1 Filed Aug. '7. 1922 v gvvuwnro'w SamueIFNewm n u ames-G. Harper Jan. 15, 1929.

' S. F. NEWMAN ETAL DIE HEAD Filed Aug. 7. 1922 3 Sheets-Sheet ZlwuenkmSamueIF Newm n James G. Harper Patented Jan. 15, 1929.

UNITED STATES- PATENT OFFICE.

SAMUEL F. NEWMAN AND JAMES G. HARPER, OF WAYNESBO RO, PENNSYLVANIA, AS-

SIGNORS TO LANDIS MACHINE COMPANY, OF WAYNESBORO, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

' DIE HEAD.

Application filed August '7, 1922. Serial No. 580,210.

, Uur said invention relates to certain improvements in a die head forcutting threads on bolts and pipes and for similar purposes, the generalfeatures of the device being similar to what is shown in the patent toMiller 1,296,546, March 4, 1919.

It is an object of our invention to provide such a die head withimproved adjusting means and with means for protecting the parts againstthe intrusion of metal shavings and other foreign matter.

Another object of our invention is to provide an improved arrangement ofparts for adjusting the cutters in case a rough cut and a second orfinishing out should be desired. Still another feature consists inimproved connecting devices between the parts of the head for holdingthe same in closed position. 1

of the ring relative to flange 11 and ring 12.

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts,

Figure 1 is a front view of our device, Figure 2, a rear view thereof,Figure 3 a section on line 3-3 of Figure 1, Figure 4, a similar sectionon line 4-4 of Figure 1,

Figure 5, a section on line 5-5 of Figure 1, Figures 6, 7, 8 and 9details showing the position of parts for certain cutting operations,and

Figures 10 and 11 details showing modified connecting pins.

In the drawings 10 indicates the shank by which the die head is held inthe machine, the shank having a forwardly projecting flange 11constituting a ring frame or ring casing rigid with the shank. A pair ofrings 12 and 13 are attached to said flange, the ring 12 being held tothe flange 11 by a longitudinally yieldable connection including bolts12 as in Figure 4 of the patent above referred to. The body 14 of thedie head is located concentrically with the flange 11 and rings 12 and13 and is held in place by the ring 12 through the medium of screws 12,the springs surrounding them, and shoulder 16 of the head body which isspaced from the ring 12 by the thin ring 15. Ring 13 turns on the bodyfor opening and closing the head by means of'pin and slot connectionsbet-ween the ring and the head as indicated at 26 (Fig. 1). A ring 18has a driving fit .on a reduced annular part of body 14, and fitsclosely in an annular recess in ring 13, thereby serving to hold theparts in place and also to close the joint between the body and thering. Thus it will be seen that head body 14, ring 18, rings 13, 12 and15 form a unit which moves forward away from flange 11 in opening thehead, as hereinafter explained. The ring 15 also has a flange 17extending rearwardly over the flange 11 to protect the joint betweenparts 11 and 15 against the entrance of dirt, when the body of the headmoves away from flange 11 and flange 17 has zero marks adapted toregister with the marks of a scale on the flange 11 to indicatedifferent rotary positions of adjustment of the body relative to theshank. The ring 15 is fixed to the body by a spline 15 to rotatetherewith and has elongated slots 15 for screws 12, 34 and 35 to permitmovement The body is held in place at the front by a ring 18 engaginggrooves in its face and in the face of the ring 13, this ring being heldin place by screws 19 (Fig. 9) engaging holes in the body.

Trunnions 21 are located in openings of the body, these trunnions beinginternally threaded and having extensions 22 on which are mounted jawsin the form of cutter holding blocks 23 carrying longitudinally-groovedchasers 23 for forming screw threads, pipe threads, etc. The chasershere shown are of the well-known Landis type, and are held in blocks soarranged as to act tangentially of the work in all positions ofadjustment. The blocks are held in place by screws 24, the trunnionsbeing held in the bores of the body by screws 25 all as in Patent No.1,296,546, above referred to. Pin and slot connections are also providedat 26 as in said patent by means of which the position of the chaser-smay be adjustably determined. In Figure 5 there is shown an adjustingdevice carried by the ring 12. This adjusting device comprises a shaftin the form of a bolt 27 having a worm 28 formed thereon and adapted toengage worm teeth at 29 on the body 14. The head of the bolt isgraduated, as shown at 30, azero mark being formed on the bore adjacentthereto. A nut 31 having notches or recesses at 31 for engagement by aspanner and a lock nut 32 of ordinary type are provided for securing theadjusting bolt under proper tension so that it is always in operativerelation and needs no locking to hold the parts in adjusted position,nor unlocking to permit adjustment of the head for size; in other wordsby this construction I am able to adjust the nut 31 on the shaft 27 andlock it in place in such a manner that the shaft and the worm,will turnwith sufficient freedom for purposes of adjustment yet without any endplay. Such end play'is undesirable in that it causes inaccuracy in theadjustment and therefore in the operation of the head but none of thedevices hitherto in use for securing this adjustment has been free fromthis objection so far as known to us.

Springs 33 are provided in the body and engage the cutter holding blocksto open the die by rotating the ring 13 about the body 14 as in theprior patent and such rotation is normally prevented by pins 34 and.

35 passing through members 12 and 15, ring 15 having clearance openings15" to permit rotary movement of body 14 and ring 15 relative to'flange11. and ring 12. The pin 34 is secured to shank 10 in any convenientmanner and extends through rings 15 and 12, having at its forward end anextension 36 engaging in a hardened bushing 37 on ring 13. It will benoted that the pins 34 and 35 have blunt ends, in contradistinction tothe tapered ends of the locking pins in such heads as that shown in thepatent to Landis 948,893.

A second internally-threaded bushing or nut 38 is located below bushing37. When the bushings are to be removed or replaced a threaded rod isengaged with bushing 38, and both bushings are removed by a pull on therod. This arrangement renders it easy to remove and replace bushings 37which are subject to considerable wear. The bushings, as will beevident, may be turned end for end in the interest of economy. Pin 35has a flange at 40, which may be omitted if, preferred, by which the pinis held in position on flange 11, said pin extending also through ring12 and having an extension 39 engaging a bushing 37 as in the case ofextension 36-0f pin 34. By reference to Figures 6 to 9 it will be seenthat the extension 39 has a re duced eccentric face atthe righthandsidewhile the extension 36 has a reduced eccentric face at each side for apurpose which will presently appear. These eccentric faces are formed onarcs of circles corresponding to the circle of the hole in thecooperating bushing 17 Thus the sides of the pins are caused to fitagainst the inner sides of the bushings without'line contact.

The pin 35 at its rear end has a handle 41 secured thereto by a pin 42,by means of ing 44 bridges the space between the shank which it may berotated through a semi-circumference, the movement of the handle beinglimited by pins 43. An internal bush- 10 and the ody- 14 and preventschips and other foreign matter from gaining access to the interior ofthe die head through the central passage.

In the operation of our device the cutter heads are arranged as shown inFigure 1 and adjusted by the means shown in Figure 5, the extent of suchadjustment being indicated by the position of the zero mark on flange 17relative tothe scale on flange 11. The ring 13 is then moved by a handle45 thereon to position the parts as shown in Figure 3 for operationwhereupon pins 34 and 35 engage in bushings 37 due to the force ofsprings 50 (Fig. 2) surrounding bolts 12'. If a single right-hand cut isdesired the lever 41 is positioned as shown in Figure 9 with theeccentric face of extension 39 to the left to receive the pressure oftools and operating devices and transmit the strain to the shank 10. Ifa second or finishing cut is desired the lever is turned over to locatethe eccentric face on the extension on the opposite side, whereby thering 13 is forced into a position to adjust the cutters closer in andthus produce the'finishing cut. In the first position it will be seenthat the extension 36 of pin 34 takes part in the work but in the secondposition as shownin Figure 8 it-does not bear "any of the pressure orthrust.

If a left-hand cut is desired the cutter heads (or the cutter heads andtrunnions as the case may be) are removed and replaced by left-handcutter heads, the relative location of trunnion bearings and springs 33be ing such as to permit ready substitution of cutter heads. The handle41 is then positioned as shown in Figure 7 if but one cut is desired,whereas if a second cut is to be made the handle is thrown over as shownin Figure 6. In this case as when cutting to the righthand the extension36 takes part in the first cut but not in the second.

As is common in machines of this type the rings 12 and 13 and the body14 are adapted for forward movement relatively to the shank when anoperation of cutting a thread on a screw or pipe has proceededsufficiently far. This results in withdrawing extensions 36 and 39 fromthe bushing 37 whereupon the heavy pressure of the springs 33 combinedwith the outward pressure between the work and the cutters causes thecutters to move outward and the ring 13 to revolve whereby a relativemovement of rotation is given to the extensions 36, 39 and bushing 37.In this rotating movement it will be seen that the extensions 36, 39maintain facial contact with the ends of the bLlSlllIlgS 37 so that theprincipal wear takes place on the ends of the renewable hardenedbushings instead of on the ring 13. The rotary movement of ring 13 islimited by one or more pins 46 on ring 12 projecting into openings 47 ofring 13.

The pins 34 and 35 serve as locking pins to hold the closing ringsecurely in head-closing position while they also serve as driving pinsto transmit the drive of the shank 10 to the head body in the case of arotary head or to prevent rotation of the head body in the case of anon-rotary head. The provision of a plurality of driving pins eliminatesall tendency for one or more parts of the head to rotate about a drivingpin, as frequently occurs where a single driving pin is used for lockingthe head, and provides a very strong and se cure drive. We do not limitourselves to such pins having eccentric faces but may utilize a pin witha. concentric extension as shown at 48 or a. straight: pin 49 ifpreferred.

The device above described is particularly well adapted for use as astationary automatic die head, and in the larger sizes of such headsthough not limited to use in any particular type or size of machine. Itwill be obvious to those skilled in the art that many other changes maybe made in the (hi-- vice above disclosed without. departing from thespirit of the invention, the true scope of which is indicated in theappended claims.

Having thus fully described our said invention, what we claim as new anddesire to secure by Letters Patent, is:

1. A die head comprising a shank, a ring frame rigid therewith, a bodyWithin the ring frame, cutters carried by said body and connected tosaid ring frame and means for adjusting said cutters comprising wormteeth on the body, a shaft on the ring frame tangential to the body, aworm on the shaft engaging said teeth, means to prevent end play of theshaft including a head at one end of the shaft bearing against a face onthe ring frame, a nut at the other end of the shaft bearing againstanother face on the ring frame, and means to lock said nut againstrotation, .substantially as set forth.

2. A die head comprising a body. radially movable tangential chasers onsaid body, a ring rotatable relatively to said shank and body andconnected to said chasers for opening and closing the die head,resilient means acting on the ring to open the head, a handle on thering for moving the same to close the head, and means for maintainingsaid chasers in closed position comprising one or more pins on one ofthe relatively rotatable members of said die head and fixed abutments onanother of said members against which said pins may rest, saidpins beingmovable lengthwise of the head and out of engagement with saidlast-named member, substantially as set forth.

3. A die head comprising a body, radially adjustable tangential chaserson said body, a ring rotatable relatively to said body and connected tosaid chasers for opening and closing the head and means for maintainingsaid chasers in closed position comprising openings in one of therelatively rotatable members of said die head, one or more pins onanother of said members approximately etlual in size to said openingssaid pins being wholly withdrawn to permit said head to open, andbushings in said openings adapted to engage the periphery of said pins,substantially as set forth.

4:. A die head comprising a body, radially adjustable tangential chaserson said body, a ring rotatable relatively to said shank and body andconnected to said chasers for opening and closing the head and means formaintaining said chasers in closed position comprising one or more pinson one of the relatively rotatable members of said die head, openings onanother of said members for receiving said pins, and bushings in saidopenings adapted to surround said pins, the relative rotation betweensuch parts being such that the ends of said pins do not. move beyond theperiphery of said bushings, substantially as set forth.

5. A die head comprising a body. radially adjustable tangential chaserson said body, a. ring rotatable relatively to said shank and body andconnected to said chasers for opening and closing the head and means formaintaining said chasers in closed position comprising a pin on one ofthe relatively rotatable members, an opening in the other, a. bushing inthe opening surrounding said pin, and a threaded nut beneath the bushingand at the bottom of the opening, substantially as set forth.

(5. A die head comprising a body, radially adjustable tangential cutterson said body, a ring rotatable relatively to said body and connected tosaid cutters for opening and closing the head, and means formaintaining. said cutters in closed position comprising a pin on one ofsaid members, and an opening in the other to receive the end of the pin,said pin having an eccentri'cally reduced portion at one end extendinginto said opening, sub stantially as set forth.

7. .A die head comprising a body, radially adjustable tangential cutterson said body, a ring rotatable relatively to said shank and body andconnected to said cutters for opening and closing the head, and meansfor maintaining said cutters in closed position comprising a pin on oneof said members and an opening in the other to receive the end of thepin said pin having eccent-rically reduced portions at opposite sidesextending into said opening. substantially as set forth.

8. A die head comjirising a body, radially adjustable tangential cutterson said body, a ring rotatable relatively to said body and connected tosaid cutters for opening and closing the head, and means for maintainingsaid cutters in closed position comprising diametrically opposite pinson one of the relatively rotatable members of said die head and openingson another of said members for receiving said pins, one of said pinshaving an eccentrically reduced portion at one side and the other havinge centrically reduced portions at both sides, substantially as setforth. 9. A die head comprising'a body, radially adjustable tangentialcutters on said body, a ring rotatable relatively to said body andconnected to said cutters for opening and closing the head, and meansfor maintaining said'j aWs inclosed position comprising a pin on one ofsa d members, an opening in the other to re- CGIVG thG end of the pin,said pin having an eccentrically reduced portion at one end extendinginto the opening, and means for imparting to said pin movements ofpartial rotatlon whereby said cutters may produce a rough cut and afinishing cut, substantially as set forth.

1 0. A die head comprising a shank, a body rig-1d therewith, radiallyadjustable longitudinally grooved tangential cutters on said body, aring rotatable relatively to said shank and body and connected to saidcutters for opening and closing the head, and means for maintaining saidjaws in closed position comprising one or more pins on one of therelatively rotatable members of said die head and openings on another ofsaid members for receiving said pins, one of said pins having aneccentrically reduced portion at one side and the other havingeccentrically reduced portions at both sides, andmeans for imparting tosaid first-named pin movements of partial rotation whereby said cuttersmay produce a rough cut and a finishing cut, substantially as set forth.

11. A die head having means for support-. ing right-hand or left-handcutters interchangeably, means for radial adjustment of said cutters andcommon means for varying the POSltlOll of sand cutters to produce afirst cut and a deeper second cut 1n elther direction of rotationcomprising a mug connected to said cutters for opening and closing them,

one or more pins for holding the ring in closed position, and means fortemporarily varying the position of said ring to change the adj ustmentof the cutters, substantially as set forth.

12. A die head having means for supporting right-hand or left-handcutters interchangeably, means for radial adjustment of said cutters andcommon means forvarying the position of said cutters to produce a firstcut and a deeper second cut in either direction of rotation comprising aring connected to cal said cutters for opening and closing them, saidrlng having an opening and a pin on the head having an eccentricextension in said opening whereby the position of the cutter may betemporarily changed to a predetermined extent, substantially as setforth.

13. In a die head, a shank having a flange,

a ring located forwardly thereof, a body within the, ring adjustable ina rotary sense relatively to the shank and movable longitudinally withthe ring relatively to the shank, said body having an annular shouldernear itsv screw-threads, means for opening and closing the headincluding a rotary member, and one or more axially extending pins toengage the rotary member for locking it in closed position, said pinsbeing Wholly Withdrawn from said member for permitting the head to open,and hardened renewable parts on said rotary member for engagement bysaid pins, substantially as set forth.

15. A cutter head having cutters to form screw-threads, rotary means foropening and closing the head, one or more axially extending pins toengage the rotary member for locking it in closed position, and one ormore of said pins having eccentric lateral faces whereby the depth ofcut may be varied, sub

stantially as set forth.

16. A cutter head having cutters to form screw-threads, rotary means foropening an closing the head, one or more axially extending pins toengage openings in the rotary member for locking it in closed position,and one or more of said pins having eccentric lateral faces whereby thedepth of cut may be varied, said faces being struck on the same radiusas the circumference of the openings to prevent a line contact between apin and the sides of an opening, substantially as set forth.

17. A cutter head having cutters to form screw-threads, rotary means foropening and closing the head, one or more axially extendtrunnions,Chasers fixed to the blocks, a ring rotatable on the body to open andclose the head and having eccentric lost-motion connection withsaidblocks, and means extending lengthwise of the body and engaging the ringto lock the head in closed position, substantially as set forth.

19. A die head comprising a body, a shank cai' rying the body,cutter-supporting. trunnions on the bodyfa ring rotatable on the bodyand connected to the trunnions for opening and c'losing the head, andone or more -;elf-locking pins fixed to move with the shank 1nd adaptedto engage directly with said ring said pins being wholly disengaged fromsaid ring by axial movement of the ring and the body relatively to theshank, substantially as set forth.

20. In a die head, a shank, a body supported thereby, an annular seriesof tangential chasers on the body, a ring rotatable on the body andconnected to the chasers to open and close the head, means for movingthe ring yieldingly in one direction, and means to hold the head closedcomprising one or more'pins on the flange adapted to engage circularopenings in the head said pins having arcuate reduced areas at theirends corresponding to the sides of said circular openings, substantiallyas set forth.

21. In a die head, a shank, a body carried by the shank and movableaxially relatively thereto, an annular series of chasers on the head, aring rotatable on the head to open or close the same, and pins on theshank adapted to engage circular openings on the head said pins havingflattened faces adapted to rest against the sides of said circularopenings without line contact, substantially as set forth.

22. In a cutter head, a body having means for supporting either a set ofright-hand or a set of left-hand cutters, a handle on the head mountedto move in a plane intersecting the axis of the head, and connectionsfrom the handle to the cutter-supporting means whereby the depth of cutof either set may be predetermined byoscillatory movements of the handlein said plane, substantially as set forth.

23. In a cutter head, a body having means for supporting either a set ofright-hand or a set of left-hand cutters, a ring surrounding the bodysaid ring being connected to the 'cutter-supporting means, a handle formoving the ring to open and close the head, a pin movable axially withrespect to the head said pin adapted to engage the ring to lock the headin closed position, and means for adjusting the pin with reference tothe re mainder of the die head to vary the Working position of thecutters, substantially as set forth.

24. Acutter head having cutters to form screw-threads, means for openingand closing the head including a rotary member, an axially extending pinadapted to engage the rotary member for locking it in closed position,and means for rotating said pin about its axisto vary the depth of cut,substantially as setforth.

25. A die head having means for supporting right-hand or left-handcutters inter changeably, common means for varying the position of saidcutters to produce a first cut and a deeper second cut in eitherdirection of rotation comprising a ring connected to said cutters foropening and closing them, a pin on the head engageable .with openings inthe ring for preventing rotation of the ring, and means for rotatingsaid pin about its axis to vary the depth of cut, substantially as setforth.

26. A die'head comprising a shank, a body, a ring frame encircling thebody said ring frame including a member rigid against rotationindependently of said shank, a plurality of cutters, means for adjustingthe body about the axis of the head independently of said shank,connections from the cutters to the body and the ring-frame to vary theoperative size of the head by such adjustment, and a member fixed to thebody said last-named member and said first-named member of the ringframe having on their peripheral faces coacting graduations forindicating the operative size of the head, substantially as set forth.

27. A die head comprising a shank, a body, a ring frame including amember rigid against rotation independently of said shank, a pluralityof cutters, means for adjusting the body about the axis of the headindependently of the shank, connections from the cutters to the body andthe ring-frame to vary theoperative size of the head by such adjustment,means for moving the cutters in or out simultaneously to close or openthe head, means for locking the head in closed position, means torelease the locking means by a forward movement of the head body andconnected parts of the ring frame, and a ring fixed to the head body tomove axially and rotatably therewith said ring having a flange coveringthe space between members of the ring frame due to such axial movementand said ring coacting With said first-named member of the ring frame toindicate the operative size of the head by means of graduations on theirperipheral faces, substantially as set forth.

28. A die head comprising a shank, a ring frame rigid therewith, a bodywithin the ring frame, cutters carried by said body and connected tosaid ring frame, means for adjusting said cutters comprising worm teethon the body, a shaft on the ring frame tangential to the body, a Worm onthe shaft engaging said teeth, means to prevent endplay of the shaftincluding a head at one end of the shaft bearing against a face on thering frame there being coacting graduations on the head and the ringframe, a nut at the other end of the shaft bearing against another faceon the ring frame, and means to lock said nut against rotation,substantially as set forth.

29. A die head comprising a head body, cutter-holders on the head body,rings about the head body including a closing ring connected to thecutter-holders said ring having recesses at the rear side, a spring forrotating said ring to move the cutter-holders outward, a shank at therear of the die head, a plurality of pins holding said shank and headbody during operation of said die head in a relatively fixed relationsaid pins having ends approximately equal in size to the recesses in theclosing ring and being movable ax ally relatively to the head body intoand out of engagement with said recesses, substantially as set forth.

30. A die head comprising a head body, cutters on the head body, ringsencircling the head body including an oscillatory ring connected to thecutters, a spring for-rotating said ring in a direction to move thecutters outward, a shank at the rear of the head, and a self-locking pinon the shank adapted to engage the closing ring for holding the cuttersin working position said pin being Wholly withdrawn from said ring torelease said ring, substantially as set forth.

31. A die head comprising a shank, a body, a ring frame encircling thebody said ring frame including a ring rigid against rotationindependently of said shank, a plurality of cutters, means for adjustingthe body about its axis independently of said shank including a worm onthe ring coacting With teeth on the head body, a head on the worm havingraduations coacting with marks on an ad acent part of the die head,connections from the cutters to the head body and the ring frame to varythe operative size of the head by such adjustment, and a member fixed tothe head body said last-named member and said first-named ring of thering frame having on their peripheral faces coacting graduations forindicating the operative size of the head said last-named graduationsbeing adjacent to the head of said Worm, substantially .as set forth.

32. In a die head, a head body, a supporting shank, chasers on the headbody, an oscillatory ring for moving the chasers into and out ofoperative position, and one or more pins fixed relatively to the shankarranged to engage said oscillatory ring for holding the chasers inoperative position said pins being Wholl withdrawn from said ring torelease the c asers, substantially as setv forth. A

33. In a die head, a head body, a supporting shank, chas'ers on the.head body, an oscillatory ring for moving the chasers into and out ofoperative position, and one or more blunt-ended pins fixed relatively tothe shank arranged to lock said oscillatory ring positively and directlyfor holding the chasers in operative position, substantially as setfort-h. i

34. In a cutter head, a head body, elongated chasers on the head bodyhaving their major axes lying in lines tangential to the work' when inWorking position, a ring rotatably mounted on the head body for openingand closing the head, and blunt-ended pins adapted to engage the ringfor locking the head in closed position one of said pins beingadjustable to vary the depth of cut'of the chasers, substantially as setforth.

35. In-a die head, a chaser holder, an elongated chaser on the holderhaving its major axis tangential to the Work circle and havingserrations on a face parallel to said major.

axis, a ring encircling the body said ring being connected to saidchaser holder to move the chaser into and out of workin position, a pinparallel to the axis of the hea arranged to engage the ring and to lockit in closed position, and means for rotating the pin about its axis tovary the depth of cut of the chaser, substantially as set forth.

In witness whereof, We have hereunto set our hands at Waynesboro, Pennslvania, this twenty-ninth day of July, A. nineteen hundred andtwenty-two.

SAMUEL F. NEWMAN. JAMES e. HARPER.

